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  Tire puncture sealant and method for makingUSPTO Application #: 20060209626Title: Tire puncture sealant and method for making Abstract: A device and a method for making a tire puncture sealant having a higher concentration of propylene glycol are disclosed, wherein the device comprises: a container having a cylindrical space for a mixed solution of rubber latex and a tackifier; a squirter comprising at least one spout for pouring propylene glycol on the surface of the mixed solution in the container at a rate of 0.01 to 1.0 liter/minute per spout; and an agitator for the mixed solution in the container, comprising a stirring blade rotatable in the mixed solution to cause said surface a current speed of the mixed solution in a range between about 1.0 and about 10.0 meter/second during pouring the propylene glycol. (end of abstract)
Agent: Birch Stewart Kolasch & Birch - Falls Church, VA, US Inventors: Yoshihide Kojima, Masahiro Kishida USPTO Applicaton #: 20060209626 - Class: 366173200 (USPTO) Related Patent Categories: Agitating, Having Specified Feed Means, Liquid Injector Within Mixing Chamber, Plural Injectors, Plural Injectors For Material From Same Source The Patent Description & Claims data below is from USPTO Patent Application 20060209626. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional application of application Ser. No. 10/446,850, filed on May 29, 2003. The entire contents of the above-identified application are hereby incorporated by reference, and priority is claimed under 35 U.S.C. .sctn. 120. BACKGROUND OF THE INVENTION [0002] The present invention relates to a device and a method for making a tire puncture sealant having a higher concentration of propylene glycol. [0003] As a puncture repair system for tubeless auto tires, a sealant injected into a tire cavity through a tire valve is a very easy effective means for the type of crown punctures made by small objects such as nails. In general, a puncture sealant includes rubber latex. If water in the rubber latex is frozen, the rubber globules in the emulsion transform into coagulum. Thus, if the puncture sealant is once frozen before use during keeping in the trunk room or the like, it becomes unusable. [0004] It is therefore, an object of the present invention to provide a device and a method for making a tire puncture sealant by which it becomes possible to make a tire puncture sealant including propylene glycol in a higher concentration to prevent its freezing without difficulty. [0005] According to one aspect of the present invention, a device for making a tire puncture sealant having a higher concentration of propylene glycol, comprises [0006] a container having a cylindrical space for a mixed solution of rubber latex and a tackifier, [0007] a squirter comprising at least one spout for pouring propylene glycol on the surface of the mixed solution in the container at a rate of 0.01 to 1.0 liter/minute per spout, and [0008] an agitator for the mixed solution in the container, comprising a stirring blade rotatable in the mixed solution to cause the above-mentioned surface a current speed of the mixed solution in a range between about 1.0 and about 10.0 meter/second during pouring the propylene glycol. [0009] According to another aspect of the present invention, a method for making a tire puncture sealant having a higher concentration of propylene glycol, comprises [0010] prepareing a mixed solution of rubber latex and a tackifier in a cylindrical space of a container, [0011] pouring propylene glycol on the surface of the mixed solution through a spout at a rate of 0.01 to 1.0 liter/minute per spout, and [0012] agitating the mixed solution in the container to cause the above-mentioned surface a current speed of the mixed solution in a range between about 1.0 and about 10.0 meter/second during pouring the propylene glycol. [0013] Embodiments of the present invention will now be described in detail in conjunction with the accompanying drawings. [0014] FIG. 1 is a schematic partial sectional view for explaining a device and a method for making a tire puncture sealant according to the present invention. [0015] FIG. 2 is a diagram showing an example of the arrangement of the spouts for propylene glycol. [0016] According to the present invention, a tire puncture sealant comprises rubber latex, a tackifier and propylene glycol C.sub.3H.sub.8O.sub.2 as an antifreezing agent. [0017] The content of the rubber latex is set in a range of from about 40 weight % to about 60 weight % of the overall weight of the puncture sealant. For the rubber latex, natural rubber latex is preferably used for its good sealing effect. Especially, deproteinized natural rubber latex is preferable because the amount of ammonia which is better to be added to prevent decomposition of proteins can be lessened. As a result, the occurrence of corrosion of tire cords and the irritating smell are reduced. Also it is possible to use synthetic rubber latex in combination with natural rubber latex, for example, latex of styrene-butadiene rubber, acrylonitrile-butadiene rubber, ethylene-vinyl acetate rubber, chloroprene rubber, vinyl pyridine rubber, butyl rubber and the like. In any case, the proportion of rubber solid content in the rubber latex is preferably set in the range of about 50 weight % to about 70 weight % of the overall weight of the rubber latex. [0018] The tackifier is added to improve the adhesion of the rubber globules of the latex to the puncture hole of the tire when the sealant is injected. For the tackifier, terpene resin, phenolic resin, polyvinyl ester, polyvinyl alcohol, polyvinyl pyrrolidone and the like are preferably used. But, especially, terpene resin and phenolic resin are preferably used. The content of the resin tackifier is preferably set in the range of from about 10 weight % to about 30 weight % of the overall weight of the puncture sealant. If the content of the resin tackifier is less than 10 weight %, the puncture sealant becomes decreased in the self-bonding properties, and the sealing itself and the retaining of the sealing effect become insufficient. If the content of the resin tackifier is more than 30 weight %, as the content of the rubber latex decreases relatively to that of the resin tackifier, the sealing power becomes decreases. [0019] Further, the puncture sealant includes a stabilizer. For the stabilizer, a surface active agent, e.g. an anionic surface active agent, ampholytic surface active agent, special carboxylic acid active agent and the like, is used. The content thereof is set in a range of from about 0.4 weight % to about 2.0 weight % of the overall weight of the puncture sealant. By the ion repulsive force of the surface active agent, the rubber globules and the tackifier resin globules are uniformly dispersed in the aqueous solution, and this state can be kept stably over the long term. [0020] According to the present invention, in order to make the freezing point of the puncture sealant below 30 degrees centigrade for example, the content of the propylene glycol is set in the range of about 25 weight % to about 35 weight % of the overall weight of the puncture sealant. Such a higher concentration of propylene glycol also provides another advantage such that the natural rubber globules are prevented from rising to the surface and becoming creamy in the storage container because the propylene glycol has a specific gravity which is close to that of the natural rubber globules. [0021] The puncture sealant is thus a milky aqueous fluid whose viscosity is about 25 cps to about 35 cps in which the rubber globules and the resin tackifier globules are uniformly dispersed in the aqueous solution of propylene glycol by the ion repulsive force of the surface active agent. [0022] Here, propylene glycol is a viscous liquid which is very amalgamative with water. Therefore, if propylene glycol is poured over the rubber latex, then, water in the latex near the interface between the latex and propylene glycol is absorbed, and the density of the rubber globules becomes very high near the interface. As a result, coagulum is very liable to be produced, and such becomes unusable as a puncture sealant. Continue reading... Full patent description for Tire puncture sealant and method for making Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Tire puncture sealant and method for making patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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